Part of the generic C120B overview — this page covers the Hyundai meaning specifically.
OBD-II Diagnostic Trouble Code
C120B
Right LED circuit open or short to battery
C
Chassis
brakes / steering
brakes / steering
1
Mfr
manufacturer code
manufacturer code
2
Chassis subsystem
0B
Right LED circuit open or short to battery
Severity · general guide
High
Brakes/steering — inspect soon
Code type
Hyundai
System
Chassis
Model
Nexo
Years
2020